package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Slf4j
@Component
public class JwtTokenUserInterceptor implements HandlerInterceptor {
    @Autowired
    private JwtProperties jwtProperties;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //获取请求头中的令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());
        //验证令牌
        try{
            log.info("jwt校验:{}", token);
            //解析令牌 获取用户id
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户id：{}", userId);
            //将用户id设置到线程变量中
            BaseContext.setCurrentId(userId); //线程变量 设置当前用户id
            //通过，放行
            return true;
        } catch (Exception e) {
            log.info("jwt校验失败");
            response.setStatus(401);
            return false;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //用完之后，清理线程变量
        BaseContext.removeCurrentId();
    }
}
